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Re: Speech signal SPL & S/N

Athanassios Protopapas wrote:
> I am looking for advice on calibrating sound pressure levels for speech
> stimuli.

This topic is covered in ITU-T standard P.56: "Objective Measurement
of Active Speech Level". The method described in the standard only
works if the SNR is better than 21dB or so.

The standard refers to two papers (which I haven't looked at myself):
(1) R.W.Berry: Speech-volumne measurements on telephone circuits,
    Proc IEE, Vol 118, No 2, pp 335-338, Feb 1971
(2) P.T.Brady: Equivalent Peak Level: a threshold independent speech level
    JASA, Vol 44, pp695-699, 1968.
Mike Brookes, EEE Dept, Imperial College, London SW7 2BT, UK
  Tel: +44 (0) 171-594-6165       Fax: +44 (0)  171-823-8125
Email: mike.brookes@ic.ac.uk
  WWW: http://www.ee.ic.ac.uk/hp/staff/dmb/dmb.html